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  1. #1
    Gold Member Gold Member AppSysCons's Avatar
    My Boats:
    CURR: 230LX, PREV:2007 30 Skater, 2003 36 Skater,1998 37 OuterLimits, B-Class race 28 Magnum
    Join Date
    Oct 2000
    Location
    Port Charlotte, FL
    Posts
    2,115

    My Skater and new TU CNC 4 blade props

    What follows below, is my opinion, based on my testing. You should consult a professional, before attempting any of these tests or changes yourself.

    This past weekend, I tried the Throttle Up CNC 14.75 x 31 4 blade props, on my boat, 30 Skater T/300XS. Compared to the 3 blade props they worked better at getting the boat on plane, quicker, easier, less vibration, they had better midrange acceleration, and wot performance, was 0.4mph faster. They do cause some additional stern lift, over 3 blade props, which makes the boat feels a bit looser, but it is manageable and water pressure is above 10lbs.

    In total, we have tried 8 different propellers:
    Merc Racing 14.5 x 32, 3 blade cleaver, lab finished
    Merc Racing 14.5 x 34, 3 blade cleaver, lab finished
    Merc Racing 15 x 32, 3 blade cleaver, double lab finished
    Merc Racing 15 x 32, 3 blade cleaver, lab finished
    Throttle-Up CNC 15 x 30, 5 blade, cleaver
    Throttle-Up CNC 14.75 x 30, 5 blade, cleaver
    Throttle-Up CNC 15 x 31, 4 blade, cleaver
    Throttle-Up CNC 14.75 x 31, 4 blade cleaver

    We have also tried 8 different setups:
    Props turning in
    Props turning out
    Prop shaft height, 7/8 above bottom
    Prop shaft height, 1 1/2 above bottom
    Prop shaft height, 1 5/8 above bottom
    Prop shaft height, 1 3/4 above bottom
    Toe out 1/4
    Toe 0

    The best setup is, 1 3/4 above the bottom, toe 0, props turning in, and a bottom modification “water ramps” to get the necessary water pressure.

    The 5 blade props just have way to much stern lift for my boat, which leave the best 3 blade and the best 4 blade prop. They are the MR 15 x 32, 3 blade cleaver, lab finish, and the TU CNC 14.75 x 31, 4 blade, cleaver.

    Here are the back to back runs for the 2 best props:

    Weather underground, NOAA, National Weather Service, and Weather Channel, reported the following at the time of my runs:
    Air temperature low/mid 90s
    Humidity 67% - 90%
    Heat index 105-110

    MR 15 x 32, 3 blade cleaver lab
    TU CNC 14.75 x 31, 4 blade cleaver

    PORT STBD AVG MPH SLIP
    MR 5837 6005 5921 97.3 9.32%
    MR 6025 5909 5937 97.9 9.46%
    MR 5994 6009 6002 99.7 8.32%

    TU 6029 6216 6213 99.2 10.59%
    TU 6042 6257 6150 99.4 10.80%
    TU 6072 6261 6186 100.1 10.44%

    I scored each prop in 4 categories; getting on plane, mid range acceleration, wot speed, and handling, giving 1 point to the prop that won each category. The final score

    3 points = TU CNC 14.75 x 31, 4 blade, cleaver
    1 points = MR 15 x 32, 3 blade cleaver, lab finish

    For me, the Throttle-Up CNC 14.75 x 31, 4 blade cleaver, are my propellers of choice and will remain on my boat.
    Attached Images Attached Images
    Frank Fasulo
    2004 Stingray 230LX
    Canon 7D | EF-S 18-200mm f/3.5-5.6 IS
    Thousands of pictures at dkorinc.embarqspace.com


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